Self-hosted, lightweight server and website monitoring and O&M tool
The Network UPS Tools repository
A suite of Monitoring Plugins (formerly known as nagios-plugins)
A utility to safely generate malicious network traffic patterns
Floating window used to display current network speed, CPU & memory
The Active Monitoring System
Lightweight network IP scanner
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Community-based GPL-licensed network monitoring system
A full packet capturing, indexing, and database system
An eye on your system
The open source time series database
BGP and RPKI monitoring tool
Raspberry Pi config for all things Internet
Open-source systems performance monitor
An open source, real-time monitoring system with custom-monitoring
Apache HertzBeat(incubating) is a real-time monitoring system
pg_activity is a top like application for PostgreSQL server activity
Open source monitoring system and time series database
A distributed and high-performance monitoring system
The core of our monitoring platform
A simple program to monitor your network/data usage
Enterprise-Grade Open-Source Network Management Platform
Zeek is a powerful network analysis framework
Application to comfortably monitor your Internet traffic